Question

2 planes leave the airport at the same time traveling in opposite directions. the first plane traveled at an average rate of 30 mph slower than the 2nd plane. after 3 hours the planes were 3150 miles apart.

enter in an equation that can be used to determine when the planes were 3150 miles apart, let x represent the average rate of the second plane.

enter the average rate of change of the 2nd plane

Answer 1

3(x+30)+3x=3150
3x+90+3x=3150
6x+90=3150
6x+90-90=3150-90
6x=3060
6x/6=3060/6
x=510
One plane flew at: x+30=510+30=540 mph
The other flew at: x=510 mph